/Engine/Source/Runtime/Engine/Classes/Kismet/GameplayStatics.h
If accessibility is enabled, have the platform announce a string to the player. These announcements can be interrupted by system accessibiliity announcements or other accessibility announcement requests. This should be used judiciously as flooding a player with announcements can be overrwhelming and confusing. Try to make announcements concise and clear. NOTE: Currently only supported on Win10, Mac, iOS
static void AnnounceAccessibleString ( const [FString](API\Runtime\Core\Containers\FString) & AnnouncementString )